The translation heavily depends on the intended context and fixing typos or supposed errors based on that context.
"The secret mission of infiltration is absolutely new." secret mission sennyuu sousakan wa zettai ni new
The provided text seems to suggest the title of an anime or manga series. There is indeed a series titled "Secret Mission: Kōtetsu no Spy" or similar variations, but specifically, "Sennyū Sousakan wa Zettai ni New" could be interpreted directly or related to known works: The translation heavily depends on the intended context
"Secret Mission: Infiltration Operation is Absolutely New." secret mission sennyuu sousakan wa zettai ni new